Prefab by Jonathan Davis with Interiors by Zem Joaquin

It's a tight 520 square feet with an interior curated to within an inch of its life by Ecofabulous.com founder and self-proclaimed sustainability expert Zem Joaquin.

The building was designed by architect Jonathan Davis and is part of the pieceHomes line of green modular homes built by OneBuild. Yes, that is a chicken coop in the backyard -- albeit a super stylish one designed by Chicken Co-op

Like what you see? From July 5-15, you can bid for it on eBay, with proceeds going to Global Green USA.